                         \begin{tabular}{l*{7}{c}} \hline \hline \noalign{\smallskip}                                       & \multicolumn{7}{c}{\shortstack{World ranking}} \\                                         \cmidrule(l){2-8}                                           & \multicolumn{1}{c}{\shortstack{1--20}}                                          & \multicolumn{1}{c}{\shortstack{21--50}}                                         & \multicolumn{1}{c}{\shortstack{51--100}}                                         & \multicolumn{1}{c}{\shortstack{101--250}}                                         & \multicolumn{1}{c}{\shortstack{251--500}}                                          & \multicolumn{1}{c}{\shortstack{501--1000}}                                          & \multicolumn{1}{c}{\shortstack{1001--2000}} \\     
\hline \noalign{\smallskip}
College graduate quality 	&    0.472\sym{***} &    0.341\sym{***}	&    0.343\sym{***} 	&    0.266\sym{***}	&    0.201\sym{***}	&    0.161\sym{***}	&    0.106\sym{***}\\
                		&  (0.022)      		&  (0.024)    		&  (0.020)  		&  (0.011)          	&  (0.011)       		&  (0.013)     		&  (0.012)             \\
				&       [19]  		&       [22]        		&       [38]      		&       [103]        		&      [154]      		&      [221]       		&      [317]           \\
                         \hline \hline \noalign{\smallskip}                         \end{tabular}                 
